Telegraph exchange system



Sept.,5, 1933. oss 1,925,909

TELEGRAPH EXCHANGE SYSTEM Filed April 13, 1932 4 Sheets-Sheet 1 P 1933- E. ROSSBERG TELEGRAPH EXCHANGE SYSTEM Filed April 15, 1932 4 Sheets-Sheet 2 I Vemlor flrlard Rude Sept. 5, 1933. E. ROSSBERG TELEGRAPH EXCHANGE SYSTEM Filed April 13, 1952 4 Sheets-Sheet 3 :Ti w h p 1933- E. ROSSBERG TELEGRAPH EXCHANGE SYSTEM 4 Sheets-Sheet 4 Filed April 13 1932 firm ffassZe .Eyen, for

X W .14 i'tirrz s Patented Sept. 5, 1933 PATET orrics TELEGRAPH EXCHANGE SYSTEM Ehrhard Rossberg, Berlin-Siemensstadt, Germany, assignor to Siemens & 'Halslie Aktiengesellschaft,

Siemensstadt, near Berlin, Germany, a corporation of Germany Application April 13, 1932, Serial No. 604,889, and in Germany April 18, 1931 11 Claims My invention relates to a telegraph exchange system, and more particularly to a system of connections for metering and rating connections in telegraph plants, which enables the rate to be paid by the calling subscribers to be determined automatically and in a simple manner, as regards the length and quality (value) of the lines engaged and the duration of engagement.

In telephone service there are known so-called time-zone metering systems, in which companion work switches provided at the home station are adjusted simultaneously with the group or remote selectors reached by setting up the connection. This system has, however, the disadvantage that the metering equipment must at any time be specially adapted to the engagement schedule according to which the connecting lines are connected to the selectors, and that the number of steps of the companion work switches is limited. This drawback becomes particularly noticeable when establishing connections across a plurality of exchanges and when extending an existing telephone system.

The disadvantage mentioned is according to my invention eliminated by transmitting in a connection passing through a plurality of exchanges from each exchange engaged by establishing the connection metering impulses corresponding with the value of the pertaining engaged connecting line, for adjusting or setting the metering counting mechanisms.

These metering or counting impulses may be sent out either when engaging a selected connecting switching means, prior to the sending out of the next train of selective impulses or alsoonly after finished selection directly following one another from the various exchanges. The value the individual connecting lines may be indi-. cated either by a certain number of metering or counting impulses or by the length of the metering impulses. The counting equipment at the exchange provided for the counting, preferably the home exchange, has consequently to integrate the metering impulses signaled back according to their number or length respectively. Simultaneously a time switching device may be provided, which also registers the duration of engagement of the line.

Further improvements will appear as the specification proceeds with reference to the'drawings afiixed thereto.

In the drawings 7 I Fig. 1 is a diagram illustrating the broad principle of my invention,

Fig. 2 isa similar diagram, but in greater detail,

Fig. 3 shows part of a complete system based on this principle, in diagram,

Fig. l, a right hand continuation of Fig. 3, illustrating, for example, a complete telegraph plant for selector or dialing operation, in which 6 the metering impulses for the zone rating are sent back to the home exchange after each selecting step, and Fig. 5 is a diagrammatic view forming a downward continuation of Fig. 3.

Reierring to Fig.1 showing a telegraph system with the exchanges A to G, in which the connecting lines between the exchanges are rated by metering impulses according to the figures marked adjacent to the respective lines. If, for instance, a subscriber of the exchange A wants to communicate with a subscriber of the exchange F, he dials hisconnection across the exchanges B, D'and E, which then has a zone value of 2+3+2+1:8 zone units. I

Fig. '2 shows diagrammatically how the return signaling of the individual zone units takes place. The calling subscriber TS dials across the group selector GW of his exchange V1 to the exchange V2 to w ich leads the toll line FLi. As soon as on engagement of the exchange V2 an initiating impulsearrives across the translating relay U2, the metering impulse sender ZGz sends back the zone impulses corresponding with the line FLI to the home exchange V1, where the impulses step round the zone selector ZW. After the further selection across the toll line selector FW of the exchange V2 the metering impulse sender ZGs of the exchange V3 sends back the metering impulses corresponding with the toll line FLz to the exchange V1, so that the zone selector ZW steps round two further steps. After continuing the selection across the selectors FW and LW of the exchange Vs a special signal is ultimately sent back to the exchange V1 on reaching the line TL leading to the desired subscriber TE, so that the time switch ZS commences with the metering of the time and steps round the meter Z of the subscriber TS in accordance with the time and the zone.

An embodiment. of my invention is illustrated diagrammatically in Fig. 3 of the drawings. Figs. 4 and 5 are the right-hand side continuation and the downward continuation respectively of Fig. 3. The illustration is confined to the switching elements necessary for establishing or setting up the connection in one direction and for explaining the details of my invention. r When the subscriber TS, the relay termination of; whose line-switch is only shown, makes a call, the line-switch VW is marked by reversing the contact 6T1 of the receiving relay ER1, not shown, no

. across the test wiper GWc., Simultaneously there known manner.

By the following impulses of the first selective train of impulses the relay A1 in the group selector is intermittently energized by the contact en across its winding I, so that across the contact 42m the circuit for the lifting magnet H prepared by the contact 4501 is closed intermittently and the group selector lifted into the desired decade. The simultaneously energized relay P1 (winding IH) remains closed during the train of T impulses due to the slow release obtained by the short-circuit winding II. When the train of impulses is finished the relay opens and across the contact 40m closes the circuit for the magnet D which had been prepared during the first lifting step, by closing of the contact 39k. The magnet is stepped round in auto-connection with the relay A1 until when testing for a disengaged relay transmitter Ua the relay P1 is again energized responds the relay Czandacross its contacts 6002 the relay X2.

Across the contact 58x2 the relay ERz is reversed into the operating position of rest, so that across the contact 62cm and the toll line FL a cut-in impulse is sent to the relay ES3 in the transmitter unit Ub of the exchange desired (Fig. 4). The relay R3 being energized will, on reversing the contact 73%: into the operatingposition of rest, send across the contact 7973 and the contact 72er of the relay ERS a minus impulse back to the diiferentialrelay ESz at the other end of the line FL so that across the contact 59es2 in the operating position of rest the relay R2 is. energized and the through connection is eiiected across the contact 5712 (Fig. 4). p

In the group selector unit of the home exchange (Fig. 3) the additional equipment for the timezone meterings has already been switched in, by

the direction-responsive slow-acting relay U.

having been energized across the contacts 801 and 612i and the relay E of the time switch having been switched in by the contact 26a.

The metering impulses are released by the metering impulse sender 2g in the transmitter set Ub (Fig. 4) by the magnet DF being energized by the closing of the contact 8603 of the relay C3 connected across the contact 811's. The stepping round takes place automatically by means of the .55 interrupter UL2, the relay G (I) being energized and placing itself in a holding circuit across the contact 849 and the winding II. The selector wiper Fz'thus stops on the last contact, as here the contact 83g is open. Meanwhile the other wiper F1 of the metering impulse sender Zg has thrice energized the impulse relay J when sweeping across the contacts 2, 3 and 4, since these three contacts are connected to one anotherand are in successive steps connected to ground by the con- 5: tact 82d controlled by the magnet DF.

The three metering impulses, which should correspond with the value of the connecting line, are sent'back to the metering relay ZR of the zone selector (DZW, ZW1,' ZWz) which is asso ciated with the group selector GW at the home exchange (Fig. 3) in the following way: The relay J (Fig. 4) controls the contact 712' which sends out corresponding positive impulses over'the toll line system FL to the receiving relay ESz at the other end of FL. The armature 598s; of this relay transmits the metering impulses over the b-wire (containing the wiper GWb) to the winding of the relay ZR (Fig. 3).

Through the agency of the relay ZH controlled by the contact 15zr the circuit for the magnet DZW of thezone selector prepared by the contact 18a is closed in impulses across the contact 1927b,

and thereby eifects the stepping round of the The above described sending back of metering impulses takes place during the establishment of the connection every time a further selective step corresponding with a connecting line is reached. Thernetering impulses are then received from the zone selector of the home exchange by a stepping round of the zone selector taking place by a number of steps corresponding with the number of metering impulses. As soon as the desired subscribers connection has been established, however, a characteristic sign is signalled back from a usual answer-back device of this subscriber, such as a double or triple transmission of the erase signal corresponding with the impulse combination 5 times minus, so that in the group selector of the home exchange (Fig. 3) the direction-responsive and strongly retarded releasing relay U is deenergized by counter-magnetization. The relay Z is energized across the contact 1211 and by opening of the contact 52 ensures the complete deenergization of the relay U.

' The relay Zsends across the contact 32 and the already closed contact 2e a control impulse to the call recording meter GZ in the c-wire of the lineswitch or preselector VW, so that this meter is operated for the first time. The relay E is tripped by short-circuiting by means of the contact 252 andremains dead as the holding circuit passing across its own contact 24a is broken. By opening the contact l3e the relay Z is deenergized again. Thecontact 112 closes during the metering impulses a spare circuit for the short-circuited winding I across the winding III of the relay C1.

The further metering impulses for controlling the call or conversation meter or counter GZ in the line-switch VW are controlled by the time switch ZS (Fig. 5 which stands under the control of-a 20-seconds switch 2O' 'S. Every time this switch reaches the contact 2 the relay M is energized and by the closing of the contact 2 1m the circuit'of the relay N is closed to remain closed across the contact 2212 and again to switch in the relay E across the contact 2371, but by opening the contact 14n at the same time the relay N prevents an action of thecontact 136 on the relay Z, for the time being. During the next rotation of 'the 20-sec0nds switch the circuit prepared for the relay F is closed across the contact 1, which relay energizes the magnet DZS of the time switch across the contact 36].

In this way the time switch ZS is stepped round by one step during each rotation of the 20-seconds switch, i. e. three steps during one minute.

In Figs. 3 and 5,'nur'nerals 101 to 116 have been applied to, corresponding wires to enable the circuits to be traced more readily.

The. time switch contacts marked 15, 12, 24 and so on, for instance cam-controlled contacts, are closed-once after a number of steps corresponding with the figure inscribed, i. e. the con tact bearing the figure 15 after 15 steps or 5 minutes, the contact 12 after 4 minutes and so on.

If now the wiper ZW1 of the zone selector stands onthe fifth contact, a ground connection is established in the positions 6, 12 and 18, i. c. after 2, 4 and 6 minutes, the relay Z responding each time and sending out a control impulse for the call recorder 62. On closure of the contact 24, i. e. after 8 minutes, a metering impulse is sent out again, the relay Z being, however, not directly grounded, but being connected to ground across the contact 381'1 and the winding I of the relay X1, This relay X1 has the object to bring about the correct stepping round of the time switch necessary for continuing the time metering into the starting position, through the agency of the wiper Z82 of the time switch ZS.

As soon as the clearing sign is given the 29-seconds switch is rendered inoperative when the re-- lays P1 and C1 release, due to the opening of the contact 2701, and by the closing'of the contact 17m across the interrupter ULl the return of the zone selector is effected by the intermittent operaion of the magnet DZW. The time switch ZS is brought into the starting position across the contact 3401 and the wiper ZS, by the relay F and the magnet DZS controlling each other in interrupter connection.

I claim as my invention:

1. In an automatic telegraph exchange system, a plurality of exchanges, junction lines between said exchanges each consisting of two transmission ways adapted respectively to transmit telegraphic impulses in opposite directions, subscribers lines in each of said exchanges, automatic switching means at said exchanges for extending a connection from a subscribers line in one exchange to a subscribers line in one of the other exchanges by means of dialling impulses sent out by the calling subscriber and transmitted over oneof the said two telegraphic transmission ways of each junction line used, and zone metering equipment for determining the charge to be made for the completed connection, said zone metering equipment being controlled by metering impulses sent back over the other of the said two telegraphic transmission ways.

2. In an automatic telegraph exchange system, a plurality of exchanges, junction lines between said exchanges each consisting of a two-wire duplex-operated transmission circuit constituting two transmission ways for transmitting telegraphic impulses in opposite directions respectively, subscribers lines in each of said exchanges, automatic switching means at said exchanges for extending a connection from a subscribers line in one exchange to a subscribers line in one of the other exchanges by means of dialling impulses sent out by the calling subscriber and transmitted over one of the said two telegraphic trans mission ways of each junction line used, and zone metering equipment for determining the charge to be made for the completed connection, said zone metering equipment being controlled by metering impulses sent back over the other of the said two telegraphic transmission ways.

3. In an automatic telegraph exchange system, a plurality of exchanges, junction lines between said exchanges each consisting of two transmission ways adapted respectively to transmit telegraphic impulses in opposite directions. subscribers lines in each of said exchanges, automatic switching means at said exchanges'for extending a connection from a subscribers line in one exchange to a subscribers line in one of the other exchanges by means of dialling impulses sent out by the calling subscriber and transmitted over one of the said two telegraphic transmission ways of each junction line used, zone metering equipment for determining the charge to be made for the completed connection, and means at the exchanges for sending back over the other of the said two telegraphic transmission ways metering impulses which control said zone metering equipment in accordance with the length or :value of the junction lines used.

4. In an automatic telegraph exchange system, a plurality of exchanges, junction lines between said exchanges each consisting of two transmission ways adapted respectively to transmit telegraphic impulses in opposite directions, subscribers lines in each of said exchanges, automatic switching means at said exchanges for extending a connection from a subscribers line in one exchange to a subscribers line in one of the other exchanges by means of dialling impulses sent out by the calling subscriber and transmitted over one of the said two telegraphictransmission ways of each junction line used, zone metering equipment for determining the charge to be made for the completed connection, and means at the exchanges for sending back over the other of the said two telegraphic transmission ways metering impulses which control said zone metering equipment in accordance with the length or value of the junction lines used, said metering impulses being sent back from each exchange which is selected on extending the desired connection, immediately after or simultaneously with engaging a connecting unit at said exchange, so that the metering equipment is adjusted. accordingly each time prior to or during the transmission of the next series of dialling impulses.

5. In an automatic telegraph exchange system, a plurality of exchanges, junction lines between said exchanges each consisting of two transmission ways adapted respectively to transmit telegraphic impulses in opposite directions, subscribers lines in each of said exchanges, automatic switching means at said exchanges for extending a connection from a subscriber's line in one exchange to a subscribers line in one, of the other exchanges by means of dialling impulses sent out by the callingsubscriber and transmitted over one of the said two telegraphic transmission ways of each junction line used, zone metering equipment for determining the charge to be made for the completed connection,

and means at the exchanges for sending back 7 over the other of the said two telegraphic transmission ways metering impulses which control said zone metering equipment in accordance with the length or value of the junction lines used, said metering impulses being sent back from the exchanges which are selected on extending the desired connection, in immediate succession only after reaching the last exchange.

6. In an automatic telegraph exchange system, a plurality of exchanges, junction lines between said exchanges each consisting of two transmission ways adapted respectively to transmit telegraphic impulses in opposite directions, subscribers lines in each of said exchanges, automatic switching means at said exchanges for extending a connection from a subscribers line in over one of the said two telegraphic transmission ways of each junction line used, zone metering equipment for determining the charge to be made for the completed connection, and means at the exchanges for sending back over the other of the said two telegraphic transmission ways,

groups of metering impulses which control said zone metering equipment in accordance with the length or value of the junction lines used, each group of said metering impulses being sent back from one of the exchanges which are selected on extending the desired connection, and corresponding in its number of impulses to the length or value of the junction line engaged. 7. In an automatic telegraph exchange system, a plurality of exchanges, junction lines between said exchanges each consisting of two transmission ways adapted respectively to transmit telegraphic impulses in opposite directions, subscribers lines in each of said exchanges, automatic switching means at said exchanges for extending a connection from a subscribers line in one exchange to a subscribers line in one of the other exchanges by means of dialling impulses sent out by the calling subscriber and transmitted over one of the said two telegraphic transmission ways of each junction line used, zone metering equipment for determining the charge to be made for the completed connectiongand means at the exchanges for sending back over the other of the said two telegraphic transmission ways metering impulses which control said zone metering equipment in accordance with the length or value of the junction lines used, each of said metering impulses being sent back from one of the exchanges which are selected on extending the desired connection, and corresponding in its length to the valueof the junction line engaged. n V

8. In an automatic telegraph exchange system, a plurality of exchanges, junction linesbetween said exchanges each'consisting of two transmission ways adapted respectively to transmit telegraphic impulses in ,opposite directions, subscribers lines in each of saidexchanges, auto matic switching means at said exchanges for extending a connection from a subscribers line in one exchange to a subscribers line in one of the other exchanges by '-means of dialling impulses sent out by the calling subscriber and transmitted over one of the said two telegraphic, trans mission ways of each junction line used, zone metering equipment for determining the charge to be made for the completed connection, said zone metering equipment being controlled by metering impulses sent back over the other of the said two telegraphic transmission ways, and

switching means which after establishing the desired connection render the zonemetering equip-1 ment independent of the telegraphic transmission ways. V a H 9. In an automatic telegraph exchange system, a plurality of exchanges, junction lines between said exchanges each consisting of twotransmission ways adapted respectively to transmit telegraphic impulses in opposite directions, subscribers lines in each of said exchanges, automatic switching means at said exchanges for extending a connection from a subscribers line in one exchange to a subscribers line in one of the other exchanges by means of dialling impulses sent out by the calling subscriber and transmitted over one of the said two telegraphic transmission ways of each junction line used, zone metering equipment for determining the charge to be made for the completed connection, said zone metering equipment being controlled by metering impulses sent back over the other of the said two telegraphic transmission ways, and switching means which after establishing the desired connection initiate the automatic time metering.

10. In an automatic telegraph exchange system, a plurality of exchanges, junction lines between said exchanges each consisting of two transmission ways adapted respectively to transmit telegraphic impulses in opposite directions, subscribers lines in each of said exchanges, automatic switching means at said exchanges for extending a connection from a subscribers line in one exchange to a subscribers line in one of the other exchanges by means of dialling impulses sent out by the calling subscriber and transmitted over one of the said two telegraphic transmission ways of each junction line used, and zoneand time-metering equipment i or determining the charge to be made for the completed connection, said metering equipment consisting of a contact device controlled by metering impulses sent back over the other of the said two telegraphic transmission ways, a further contact device, and a time switch. controlling said second device, in order to effect the metering in accordance with the zone of the established connection as well as with the length of time the connection has been used.

11. In an automatic telegraph exchange system, a plurality of exchanges, junction lines between said exchanges each consisting of two transmission ways adapted respectively to transmit telegraphic impulses in opposite directions, subscribers lines ineach of said exchanges, auto-, matic switching means at said exchanges for extending a connection from a subscribers line in one exchange to a subscribers line in one of the other exchanges by means of dialling impulses sent out by the calling subscriber and transmitted over one of the said two telegraphic transmission ways of each junction line used, zone metering equipment for determining the charge to be made for each completed connection in accordance with the length or value of the junction line used, and a further metering equipment which registers only the number of connections established.

EHRHARD ROSSBERG. 

